The name of two species of reptiles which form the family Gaviidae in the order Crocodilia. The Indian gavial (Gavialis gangeticus) is confined to the Ganges River and its tributaries and may attain a length of 30 ft (9 m), while the Malayan gavial (Tomistoma schlegeli) is found in Borneo and Sumatra and has a maximum length of about 15 ft (4.5 m).